diff --git a/memory/memory_demo.py b/memory/memory_demo.py
index 7eca400..2512432 100644
--- a/memory/memory_demo.py
+++ b/memory/memory_demo.py
@@ -1,37 +1,59 @@
-import logging
 import os
-
 import dotenv
-from langchain.chains.llm import LLMChain
-from langchain.memory import ConversationBufferMemory
-from langchain_core.prompts import ChatPromptTemplate, MessagesPlaceholder
+import logging
 from langchain_openai import ChatOpenAI
+from langchain_core.prompts import ChatPromptTemplate, MessagesPlaceholder
+from langchain_core.runnables.history import RunnableWithMessageHistory
+from langchain_community.chat_message_histories import ChatMessageHistory
+from langchain_core.chat_history import BaseChatMessageHistory
+
 
 logging.basicConfig(
     level=logging.DEBUG,
     format="%(asctime)s - %(name)s - %(levelname)s - %(message)s"
 )
+
 dotenv.load_dotenv()
 
-## 设置环境变量
+# 1. 设置环境变量
 os.environ['OPENAI_API_KEY'] = os.getenv("SILICONFLOW_API_KEY")
 os.environ['OPENAI_BASE_URL'] = os.getenv("SILICONFLOW_BASE_URL")
 
-# 默认的 'model_name': 'deepseek-ai/DeepSeek-V3.1',
-llm = ChatOpenAI(model="Qwen/Qwen3-8B")
+# 2. 初始化模型
+llm = ChatOpenAI(model="deepseek-ai/DeepSeek-V3.1")
 
+# 3. 定义 Prompt (现代版无需手动处理 question 变量)
 prompt = ChatPromptTemplate.from_messages([
     ("system", "你是一个万能的人工智能AI"),
     MessagesPlaceholder(variable_name="history"),
-    ("human", "问题：{question}")
+    ("human", "{question}")
 ])
 
-## 创建 Memory 对象
-memory = ConversationBufferMemory(return_messages=True)
+# 4. 【核心改動】使用 LCEL 組合鏈
+# 這裡不需要 LLMChain，直接用管道符
+chain = prompt | llm
 
-chain = LLMChain(prompt=prompt, memory=memory, llm=llm)
-res1 = chain.invoke({"question":"我是小明"})
-print(res1)
-print()
-res2 = chain.invoke({"question":"我是谁？"})
-print(res2)
+# 5. 管理記憶體 (現代版做法：使用字典存儲不同 Session 的歷史)
+store = {}
+
+def get_session_history(session_id: str) -> BaseChatMessageHistory:
+    if session_id not in store:
+        store[session_id] = ChatMessageHistory()
+    return store[session_id]
+
+# 包裝成帶有記憶功能的鏈
+with_message_history = RunnableWithMessageHistory(
+    chain,
+    get_session_history,
+    input_messages_key="question",
+    history_messages_key="history",
+)
+
+# 6. 執行調用
+config = {"configurable": {"session_id": "xiaoming_test"}}
+
+res1 = with_message_history.invoke({"question": "我是小明"}, config=config)
+print(f"回答1: {res1.content}")
+
+res2 = with_message_history.invoke({"question": "我是谁？"}, config=config)
+print(f"回答2: {res2.content}")
\ No newline at end of file
diff --git a/memory/memory_desc.py b/memory/memory_desc.py
index 38f15c0..82a68c2 100644
--- a/memory/memory_desc.py
+++ b/memory/memory_desc.py
@@ -34,7 +34,7 @@ os.environ['OPENAI_API_KEY'] = os.getenv("SILICONFLOW_API_KEY")
 os.environ['OPENAI_BASE_URL'] = os.getenv("SILICONFLOW_BASE_URL")
 
 # 默认的 'model_name': 'deepseek-ai/DeepSeek-V3.1',
-llm = ChatOpenAI(model="moonshotai/Kimi-Dev-72B")
+llm = ChatOpenAI(model="deepseek-ai/DeepSeek-V3.1")
 
 memory_test = ConversationSummaryMemory(llm=llm)
 memory_test.save_context({"input": "我叫小明"}, {"output": "噢，好的，你叫小明"})